GAUSS8 1998 Problem 12

Past Contests GAUSS8 GAUSS (GR. 8) - 1998
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1

In the 4\times4 square shown, each row, column and diagonal should contain each of the numbers 1,2,3, and 4. Find the value of K+N.

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Answer Choices
A. 4
B. 3
C. 5
D. 6
E. 7